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Geochemical Characteristics of Groundwater for Dry and Rainy Seasons in Ddan-sum Island  

Kim, Gyoobum (K-water 연구원)
Jeon, Hangtak (지오그린21)
Shin, Seonho (K-water 연구원)
Park, Joonhyeong (K-water 연구원)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.9, 2012 , pp. 31-44 More about this Journal
Abstract
Seasonal changes in groundwater geochemistry exist in Ddan-sum island. In the farming season of April, the spatial distribution of ions explains that $Fe^{2+}$, Fe(total), $Mn^{2+}$, $Ca^{2+}$, $Mg^{2+}$, $SiO_2$, ${HCO_3}^-$, and ${NO_3}^-$ are high in the center of the island, but $Na^+$ and $K^+$ are relatively low and these high anions indicates the effect of fertilizer used for strawberry cultivation. Spatial variation of ion concentration is smaller in August than April because of low agricultural activity and heavy rainfall. Geochemical type of groundwater shows that the center of island has the characteristics of recharge zone but the rim area corresponds to a mixing zone between groundwater and stream water. According to the analysis of saturation index for Fe and Mn ions, hematite, goethite, and rhodochrosite under supersaturation have a possibility of additional mineral deposition, and siderite, $Fe(OH)_3$, manganite, pyrolusite, and pyrochroite under unsaturation may exist as a type of dissolved ion.
Keywords
Geochemistry; Groundwater; Cluster analysis; Saturation idex; Fe and Mn;
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